AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 178
![no-image](/images/manufacturer_photos/0/0/14/advanced_micro_devices_sml.jpg)
AM79C976
Manufacturer Part Number
AM79C976
Description
PCnet-PRO 10/100 Mbps PCI Ethernet Controller
Manufacturer
Advanced Micro Devices
Datasheet
1.AM79C976.pdf
(309 pages)
- Current page: 178 of 309
- Download datasheet (3Mb)
13
12
11
10
9
178
RES
TXDPOLL
APAD_XMT Auto Pad Transmit. When set,
ASTRP_RCVAuto Strip Receive. When set,
MFCO
zero and read as undefined.
POLL is set, the Buffer Manage-
ment Unit will disable transmit
polling. Likewise, if TXDPOLL is
cleared, automatic transmit poll-
ing is enabled. If TXDPOLL is set,
TDMD bit in CSR0 must be set in
order to initiate a manual poll of a
transmit descriptor. Transmit de-
scriptor polling will not take place
if TXON is reset. Transmit polling
will take place following Receive
activities.
Read/Write
POLL is cleared by H_RESET or
S_RESET and is unaffected by
the STOP bit.
APAD_XMT enables the auto-
matic padding feature. Transmit
frames will be padded to extend
them to 64 bytes including FCS.
The FCS is calculated for the en-
tire frame, including pad, and ap-
pended after the pad field. When
the auto padding logic modifies a
frame, a valid FCS field will be
appended to the frame, regard-
less of the state of the DXMTFCS
bit (CSR15, bit 3) and of the
ADD_FCS bit in the transmit de-
scriptor.
Read/Write
APAD_XMT
H_RESET or S_RESET and is
unaffected by the STOP bit.
ASTRP_RCV enables the auto-
matic pad stripping feature. The
pad and FCS fields will be
stripped from receive frames and
not placed in the FIFO.
Read/Write
ASTRP_RCV
H_RESET or S_RESET and is
unaffected by the STOP bit.
effect. Read as undefined.
Reserved Location. Written as
Disable Transmit Polling. If TXD-
Obsolete function. Writing has no
accessible.
is
is
cleared
cleared
P R E L I M I N A R Y
accessible.
accessible.
TXD-
Am79C976
by
by
8
7
6
5
4
3
2
MFCOM
UINTCMD
UINT
RCVCCO
RCVCCOM Obsolete function. Writing has no
TXSTRT
TXSTRTM
Read/Write accessible. UINTC-
MD is always read as 0.
Read/Write accessible. UINT is
cleared by the host by writing a 1.
Writing a 0 has no effect. UINT is
cleared
S_RESET or by setting the STOP
bit.
When TXSTRT is set, INTA is as-
serted if IENA is 1 and the mask
bit TXSTRTM is 0.
Read/Write accessible. TXSTRT
is cleared by the host by writing a
1. Writing a 0 has no effect. TX-
STRT is cleared by H_RESET,
S_RESET, or by setting the
STOP bit.
Read/Write
STRTM is set to 1 by H_RESET
or S_RESET and is not affected
by the STOP bit.
effect. Read as undefined.
UINTCMD can be used by the
host to generate an interrupt un
related to any network activity.
Writing a 1 to this bit causes
UINT to be set to 1, which in turn
causes INTA to be asserted if in-
terrupts are enabled.
Am79C976 controller after the
host has issued a user interrupt
command by setting UINTCMD
(CSR4, bit 7) to 1.
Obsolete function. Writing has no
effect. Read as undefined.
effect. Read as undefined.
Am79C976 controller whenever it
begins transmission of a frame.
STRTM is set, the TXSTRT bit
will be masked and unable to set
the INTR bit.
Obsolete function. Writing has no
User
User Interrupt. UINT is set by the
Transmit Start status is set by the
Transmit Start Mask. If TX-
Interrupt
by
accessible.
H_RESET
Command.
8/01/00
TX-
or
Related parts for AM79C976
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![AM27S29DC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Advanced Micro Devices [4,096-Bit (512x8) Bipolar PROM]
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM27S29APC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Advanced Micro Devices [4,096-Bit (512x8) Bipolar PROM]
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM29BL802CB-70RZE](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Advanced Micro Devices [8 Megabit (512 K x 16-Bit) CMOS 3.0 Volt-only Burst Mode Flash Memory]
Manufacturer:
Advanced Micro Devices
Datasheet:
![M41000001Y](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
M41000001YAdvanced Micro Devices [32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (512 K x 8-Bit/256 K x 16-Bit) Static RAM]
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM95C94JC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Advanced Burst Error Processor
Manufacturer:
Advanced Micro Devices
![AM7992BPC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Serial interface adapter (SIA)
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM9519ADC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Universal interrupt controller
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM27C256-150DC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
256 kilobit CMOS EPROM
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM9128-10PC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
2048 x 8 static RAM, 100ns
Manufacturer:
Advanced Micro Devices
Datasheet:
![P8284A](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Manufacturer:
Advanced Micro Devices
Datasheet:
![DM81LS98N](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Three-State Octal Buffers
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM2966PC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
AM2966PCOctal Dynamic Memory Drivers with Three-State Outputs
Manufacturer:
Advanced Micro Devices
Datasheet:
![DM81LS97N](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Three-State Octal Buffers
Manufacturer:
Advanced Micro Devices
Datasheet:
![DM81LS96N](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Three-State Octal Buffers
Manufacturer:
Advanced Micro Devices
Datasheet:
![PAL16L8-7PC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
TTL programmable array logic, 7ns
Manufacturer:
Advanced Micro Devices
Datasheet: